Career
This title was confirmed by a royal charter, dated 22 March 1617, the countess resigning her rights in his favour, and he was allowed the possession and exercise of all honours, dignities, and precedence of former earls of Buchan. On the accession of Charles I, Buchan became one of the lords of the bedchamber. He lived chiefly in London, where he died in 1640.
He was buried at Auchterhouse, Forfarshire.